Mode-S Codes Set To Replace SSR Codes

Aviation International News » April 2008
March 31, 2008, 5:33 AM

A Lufthansa Boeing 737 recently became the first aircraft to use mode-S capability to transmit its radar identification (flight ID), without the use of a secondary surveillance radar (SSR) code. The 737 flight crew was able to automatically correlate the aircraft’s electronic flight plan data by entering a 24-bit code into the aircraft computer. Rod Marten, who oversees mode-S operations at Eurocontrol, said a 24-bit code is necessary because the short supply of four-digit SSR codes–4,096 in total–requires European controllers to make an average of 20,000 code changes a day and duplicate aircraft codes. There are approximately 17 million 24-bit codes, however.

FILED UNDER: 
ATC
Share this...

Please Register

In order to leave comments you will now need to be a registered user. This change in policy is to protect our site from an increased number of spam comments. Additionally, in the near future you will be able to better manage your AIN subscriptions via this registration system. If you already have an account, click here to log in. Otherwise, click here to register.

 
X